<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>岁月</title>
    <script src="./base.js">
        window.onload=function(){
            var year=$('.year');
            year.onkeypress=function(){
                var regExp=/^\d{4}-\d{2}-\d{2}$/;
                if(year.value.match(regExp)){
                    console.log('正确');
                
                }else{
                    console.log('错误');
                }
            }
        }
    </script>
</head>
<body>
    <input type="text" class="year">
</body>
</html>